基于相关累积的雷达信号到达时间估计算法

Estimation Algorithm of Radar Signal Arrival Time Based on Correlated Accumulation

针对低信噪比环境下脉内调制雷达信号到达时间估计精度不高的问题,提出了基于相关累积的雷达信号到达时间估计算法。该算法对信号进行一阶自相关运算后作滑动平均得到信号到达时间和脉冲宽度的粗估计,然后对其倒序累加并构造检测函数,通过搜索检测函数最大值的位置得到到达时间的精估计。蒙特卡洛仿真实验表明,该算法对信号的脉内调制方式具有较强的鲁棒性,具有较高的估计精度且运算量较低,便于实时处理。

Aiming at the low estimation accuracy of the arrival time of intra pulse modulation radar signal in low SNR environment,an estimation algorithm of radar signal arrival time based on correlated accumulation was proposed.The first order autocorrelation operation of the signal was carried out by using this algorithm,then the arrival time of the signal and the rough estimation of pulse width were obtained by carrying out the moving average,and then the reverse accumulation was carried out and the detection function was built.Subsequently the precise estimation of the arrival time was obtained by searching the location of the maximum value of search function.The Monte Carlo simulation experiments show that the proposed algorithm has strong robustness to the intra pulse modulation of signal,and has high estimation accuracy and low computation volume,which is convenient for real-time processing.